JPH07322314A - Method for increasing extension line for small-sized private branch line controller - Google Patents

Abstract

PURPOSE:To increase the number of extension lines capable of being connected to one set by increasing trunk lines to the extension lines and making them connectable in a wide-range place. CONSTITUTION:Since (n) lines of the trunk lines are connected through switches 10 and (i) lines of the extension lines are connected to a key telephone system 1, it is similar for the key telephone system 6 as well and (j) sets of the key telephone systems are present, the total number (m) of the extension lines is (i)X(j). Then, the installation place of the key telephone system 6 to be increased is near a place where extension telephone sets are to be remarkably increased, the plural key telephone systems 1 and 6 are connected respectively by the signal line 9 of a system capable of performing serial transmission at a high speed in relatively long distances and serial data are transferred. On the other hand, the trunk lines are connected to all the key telephone systems 1 and 6 by performing connection through the switches 10 built-in the key telephone system 1 itself capable of switching control or the like. Then, under the control of the key telephone system 1 set as a master, all the key telephone systems 6 set as slaves are operated in an order.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a button telephone system for connecting n office lines to a number of extension lines generally larger than n, in which a small button telephone system having a small connection capacity is relatively separated. 1 by installing multiple units dispersed in the place
The present invention relates to an extension method for a small-sized private line control device (button telephone device) capable of multiplying the number of extensions that can be connected to a plurality of units (the same as the number of installed units).

[0002]

2. Description of the Related Art When connecting a plurality of office lines to more extension lines, a key telephone device has been conventionally used in a local office. FIG. 7 is a block diagram of a small premises line control system using a conventional button telephone device. 1 is a button telephone device housed in a housing, 2 is an extension control board which is built in the button telephone device and controls an extension line, 3
Is a telephone connected to an extension line, 4 is a two-line telephone line or office line provided by a telecommunications carrier, and 5 is a two-line or four-line private telephone line or extension wired in a premises.

The office line 4 is generally connected to the key telephone device 1 via a main terminal board, and the telephone 3 is connected to the key telephone device 1 by an extension 5 wired in the office.
In the housing of the button telephone device 1, j extension control boards 2 are mounted, and one extension control board 2 can control i extensions. It is possible to control j = m extensions.

The operation of the key telephone device 1 includes an operation of receiving a call from the office line 4, an operation of making a call from the telephone 3 to the office line 4, and a telephone 3
It can be classified into three types of extension calls between each other. The incoming call operation is determined by calling from the central line 4 by the representative telephone number or individual telephone number of the central line, all the extension telephones 3 or a certain range of telephones 3, or direct in-line calling. Calling a telephone or a designated telephone with a direct-in dial with a bell sound, and connecting the station line 4 and the extension 5 when the handset of a certain telephone 3 is lifted up, and the calling operation is
When the handset of the telephone 3 is lifted and a call is requested,
It searches for an empty station line 4, connects the extension line 5 and the station line 4 connected to the telephone if they are free, and then makes a call to the station line 4. The extension call is the telephone set 3 When the handset is lifted and an extension call is requested, another telephone 3 is called, and when the handset of the telephone 3 is lifted, the extension telephones 3 are connected to each other.

[0005]

In the key telephone device 1 shown in FIG. 7, as the number of required telephones 3 increases, the number of extension control boards 2 must be increased accordingly, and at the same time, the key telephone device. It is also necessary to make the housing of No. 1 large. So if you expect more phones,
There was a problem in that a housing with a sufficient size had to be prepared for the button telephone device 1 from the beginning of installation. Further, in the case of a large office or the like, there has also been a problem that it is necessary to lay as many private telephone lines, that is, the extension lines 5 from the extension control board 2 to the telephone 3 as many as the telephones 3.

The present invention solves the above-mentioned conventional inconvenience, and prepares a large casing or a place where it can be installed from the beginning in order to increase the number of extension lines for the private line control system by the button telephone device. It is an object of the present invention to provide an extension extension method for a small premises line control device that does not interfere with the preparation.

[0007]

In order to solve the above-mentioned problems, in the present invention, a small-sized button telephone device having about one extension control board built therein is used as a constituent unit of the line control system, and extension telephones are added. The number of small-sized button telephone devices, which are the unit of the line control system, will be sequentially increased to any desired number, and the additional button telephone devices will be installed at locations where it is desired to significantly increase the number of extension telephones (in the same building. In the vicinity of another room, another floor, or another building, a plurality of key telephone devices can transmit serially over a relatively long distance at high speed (for example, balanced differential or unbalanced). An electrically connected long-distance communication method such as a differential method, or a long-distance communication method that is not electrically connected by a photocoupler, a pulse transformer, or a glass fiber. The long-distance communication method for optical communication using a cable, etc.) is used to connect and receive serial data, while the station line is connected via the switch controllable switch built into the key telephone device itself. Or connect
Alternatively, all the key telephone devices are connected in parallel by a branch connection method, or the voice signals are converted into digital signals and placed on the signal line capable of serial transmission to connect to all the key telephone devices.

[0008]

By adopting the above means, since all the key telephone devices set as slaves operate in sequence under the control of the key telephone device set as the master, any extension telephone can be called. Further, it is possible to reliably make a call from any extension telephone to the office line. In this method, a station line changeover switch is newly built in and additionally installed, but this switch can be realized at a very low price without any problem with a general relay.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the configuration of a key telephone device used as a structural unit of a private line control system when implementing the present invention. In the figure, 1 is a button telephone device housed in a housing, 2 is about one extension control board, 3 is a (extension) telephone connected to the extension control board, and 4 is a two-line provided by a telecommunications carrier A telephone line or station line 5 is a two-line or four-line premises telephone line or extension wired in the premises. 2, 3 and 4 show a switch of the button telephone device shown in FIG. 1 between the central office line 4 and the extension control board 2 which is switchable and controllable by the button telephone device itself. 5 is a configuration in which the station line 4 is branch-connected to each button telephone device, and FIG. 6 is a configuration in which the station line is only connected to the button telephone device set as the master and set as a slave. FIG. 3 is a diagram showing a configuration that is not physically connected to a key telephone device and that is dependent only on a signal line of a system capable of serial transmission over a relatively long distance, which is sequentially connected between the key telephone devices.

FIG. 2 is a diagram showing a first embodiment of the present invention.
Is a key telephone device set as a slave by a DIP switch, 7 is a telephone connected to the slave,
8 is an extension connected to the slave, 9 is a serial data transmission line connecting between the master and the slave, 10 is a switch for switching and connecting the station line to each button telephone device, 40 is a switch from the output side of the master switch A station line connected to the button telephone device, 41 is a station line connected from the switch output side to the slave button telephone device,
Other reference numerals are the same as those in FIG. 1, except that the key telephone device 1 is set as a master by a DIP switch. As described above, the key telephone device 1 has the switch 1
0 station lines are connected through 0 and i extension lines are connected through i. The same applies to the button telephone device 6. Since there are j key telephone devices, the total number m of extension lines is i × j, which is the same as in the conventional system.

The configuration of the first embodiment is different from that of the conventional example shown in FIG. 7 in that, in order to control the connection to the same number of extension lines with the same number of office lines, small and similar button telephone devices are dispersed. It is a point that multiple units are arranged.

When receiving an incoming call, it operates as follows. When a call is made from the station line, the master button telephone device 1 calls the telephone 3 connected to itself, and the slave button telephone device 6 is called from the station line through the serial data transmission line 9. I will tell you that there was. A text message consisting of a plurality of bytes is exchanged on the serial data transmission line 9, and different meanings are given depending on the contents. In addition, various procedures for exchanging text (TCP commonly used in LAN)
/ IP procedure, BSC procedure used in the line, HDLC procedure, etc.). As an actual signal form on the transmission line, an analog signal obtained by modulating a digital signal, a DTMF signal (dual-tone multi-frequency) used in a push button telephone, or a baseband signal on which a digital signal is directly used is used. The slave button telephone device 6 calls the telephone 7 upon receiving this notification. When any of the handsets of the telephone 3 is lifted, the key telephone device 1 connects the central office line 40 and the extension 5 and also informs the key telephone device 6 to stop calling the telephone 7. Also phone 7
When any one of the handsets is first picked up, the key telephone device 6 connects the central office line 41 and the extension 8 and also informs the key telephone device 1 to stop calling the telephone 3. Upon receiving this notification, the key telephone device 1 switches the corresponding changeover switch 10 to the slave side.
When the handset of the telephone 3 is lifted first and it is not addressed to itself, the transfer button of the telephone 3 is pressed and then the handset is placed on the telephone. Then, the button telephone device 1
Is the key telephone device 6 through the serial data transmission line 9.
To call the telephone 7. Upon receiving this, the key telephone device 6 calls the telephone 7 again or displays that there is a transfer. When the telephone 7 is lifted in this state, the key telephone device 6 connects the office line 41 and the extension 8 and informs the key telephone device 1 to switch the switch 10. The handset of the telephone 7 is lifted first, and when it is not addressed to itself, the telephone 3 is called again by the same operation. When the call from the central office line is direct in-line, the master button telephone device 1 contacts the slave button telephone device 6 to which the corresponding telephone is connected so as to call the corresponding telephone through the serial data transmission line 9 and performs the corresponding switching. The switch 10 is switched to the slave side. Further, in the case of direct in dialing, after the key telephone device 1 receives the extension number received, the corresponding telephone 7 is called through the serial data transmission line 9 to the slave button telephone device 6 connecting the designated telephone. Simultaneously with the contact, the corresponding switch 10 is switched to the slave side.

When a call is made from an extension, the operation is as follows. When a call request is issued from the telephone set 3, the master button telephone device 1 connects the vacant office line 4 and extension line 5. Phone 7
When there is a call request from the slave button telephone apparatus 6, the slave button telephone apparatus 6 informs the button telephone apparatus 1 through the serial data transmission line 9 to switch the switch 10 corresponding to the vacant station line 4. After the key telephone device 1 has switched, when the key telephone device 6 is notified of that, the key telephone device 6 connects the office line 41 and the extension 8.

When a call is made between extension lines, it operates as follows. When there is a call request from the telephone 3, the key telephone device 1
Is a serial data transmission line 9 to the key telephone device 6.
Contact the call request via. In this state, a call becomes possible, the call signal is converted into a digital signal in the key telephone devices 1 and 6, and is transmitted / received through the serial data transmission line 9. It operates similarly between other key telephone devices. The switch does not necessarily have to be built in, as can be seen from this function.

The second embodiment shown in FIG. 3 eliminates the relationship between the master and the slave in the first embodiment and allows the office line to be connected to an arbitrary key telephone device. The office line connected to an arbitrary or i-th button telephone device is connected to the changeover switch of the i + 1th button telephone device, and the office line connected to the j-th button telephone device is connected to the first button telephone device. It is connected to the changeover switch in a loop. The operation is the same as that of the first embodiment except that the key telephone devices to which the central office line is connected each operate as a master.

The third embodiment shown in FIG. 4 is different in that the controllable built-in changeover switch is a three-way changeover system. The station line is not connected in the order of i → i + 1 → i + 2 → only in the larger direction, but i → i + 1 → ... j
And a direction in which i becomes larger and a direction becomes smaller as i → i−1 → i−2 → 1. The operation is similar to that of the second embodiment.

The fourth embodiment shown in FIG. 5 is similar except that the office line is connected to the branch connection point 11 instead of being connected to the changeover switch 10 in the first embodiment. The operation is the same except that there is no operation to switch the above switches. In this embodiment, the number of key telephone devices that can be connected is limited.

The fifth embodiment shown in FIG. 6 is the same as the first embodiment except that the call signal transmitted through the office line is transmitted through the serial data transmission line 9.

When receiving a call, it operates as follows. Phone 3
The method of calling 7 or 7 is the same as in the first embodiment. After that, when any of the handsets of the telephone set 3 is lifted, the key telephone unit 1 connects the central office line 4 and the extension line 5 and informs the key telephone unit 6 to stop calling the telephone set 7. When any handset of the telephone 7 is lifted first, the key telephone device 6 informs the key telephone device 1 to stop calling the telephone 3. After that, the key telephone devices 1 and 6 digitize the call signals from the office line 4 and the extension line 8 and transmit them through the serial data transmission line 9. In the case of direct in-line or direct in-dial, it is the same as the case of the first embodiment except that the call signal is transmitted through the serial data transmission line 9.

When a call is made from the extension, the operation is as follows. When a call request is made from the telephone set 3, the key telephone device 1 connects the vacant office line 4 and extension line 5. When there is a call request from the telephone set 7, the key telephone device 6 sends an empty station line 4 to the key telephone device 1 through the serial data transmission line 9.
Contact us to assign you. After allocating a vacant station line, the button telephone system 1 informs the button telephone system 6 of that fact. After that, the button telephone systems 1 and 6 digitize the call signals from the station line 4 and the extension 8 and serialize them. It is transmitted through the transmission line 9.

When a call is made between extension lines, it operates as follows. When there is a call request from the telephone 3, the key telephone device 1
Sends a call request to the key telephone device 6 through the serial transmission line 9. In this state, a call becomes possible, the call signal is converted into a digital signal in the key telephone devices 1 and 6, and is transmitted / received through the serial data transmission line 9. It operates similarly between other key telephone devices.

[0022]

As described above, according to the present invention, it is possible to lay an extension line that accompanies the installation of an extension telephone in a relatively large office or the like with a relatively short wire rod, and thus it is easy to lay it. Also, the amount of wire rod is reduced, which makes it economical. Furthermore, it is economical because it is possible to add one type of small-sized button telephone device each time when the number of extension lines is increased, according to the required number, which is economical, and it is not necessary to prepare a large installation site first. You can get the effect.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a key telephone device used as a configuration unit of a private line control system when implementing the present invention.

FIG. 2 is a diagram showing a first embodiment of the present invention.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a third embodiment of the present invention.

FIG. 5 is a diagram showing a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a fifth embodiment of the present invention.

FIG. 7 is a block diagram of a small premises line control system using a conventional key telephone device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Master button telephone device, 2 ... Extension control board incorporated in the button telephone device to control an extension, 3 ... Telephone connected to master, 4 ... Provided by telecommunications carrier 2
Wire telephone line or office line, 5 ... 2-wire or 4-wire premises telephone line or extension connected to a master, 6 ... Slave button telephone device, 7 ... Telephone connected to slave, 8 ... extension connected to slave, 9 ... signal line capable of serial data transmission over a relatively long distance connecting master telephone device and slave telephone device, 10 ... switching station line to respective button telephone device A switch that is controlled by a button telephone device, 11 branch connection points, 40 ... Station line to master after passing through switch, 41 ... Station line to slave after passing through switch.

Claims (4)

[Claims] 1. A button telephone device capable of connecting a maximum of n telephone lines of a normal subscriber telephone network, that is, a central line, and connecting a maximum of i extension lines at a local location such as the same floor or the same room of a building. In a key telephone control system consisting of j small-scale private branch line control devices, also called DIP switches that switch between master mode and slave mode, one key telephone device is set as the master and the following key telephone devices are set as slaves. Then, first connect the n station lines to the controllable switch that is built in the master and installed additionally,
Next, by connecting the extension line connected to the output side of this switch to the controllable switch in the slave, the slave is indirectly connected to the extension line. Connect to the slave, and on the other hand the master,
By sequentially connecting each slave with a signal line capable of serial transmission over a relatively long distance at high speed, and transmitting and receiving serial data between the master and slave under the control of the master, n station lines are separated. An extension extension method for a small premises line control device, characterized in that it is possible to connect by expanding to j times as many as i extension lines in a wide range of places such as the floor, another room or another building. 2. A key telephone control system comprising j key telephone devices, which is capable of connecting a maximum of n central office lines and connecting a maximum of i extension lines at a local place such as the same floor or the same room of a building. , N or less arbitrary number of station lines are connected to any button telephone device via a controllable switch incorporated therein, and the station line extension line connected to the output side of this switch is then separated. By connecting to a controllable switch in any of the key telephone equipment, the key telephone equipment is indirectly connected to the central office line, and in the same manner, the central office extension line is subsequently connected to other key telephone equipment. Further, each key telephone device is connected with a signal line capable of serial transmission at a relatively high distance over a relatively long distance, and each key telephone device transmits and receives serial data to and from each other, so that n station lines are separated from each other in the building. On the floor In broad location, such as a different room or different building, extension adding method of a small private telephone control device being characterized in that to be able to connect in the enlarged i book j times extension. 3. A key telephone control system comprising j key telephone devices, which is capable of connecting a maximum of n central office lines and connecting a maximum of i extension lines at a local place such as the same floor or the same room of a building. , N station lines are connected to each button telephone device in a branch system, that is, in a parallel system, with a DIP switch or the like for switching between master mode and slave mode,
First, set the key telephone device to which the central office line is connected as the master and the subsequent key telephone devices as slaves,
The slaves are sequentially connected by a signal line capable of serial transmission over a relatively long distance at high speed, and the master and slaves exchange serial data under the control of the master to separate n station lines. An extension extension method for a small premises line control device, characterized in that it is possible to connect by expanding to j times as many as i extension lines in a wide range of places such as the floor, another room or another building. 4. A key telephone control system comprising j key telephone devices, which is capable of connecting a maximum of n central office lines and connecting a maximum of i extension lines at a local place such as the same floor or the same room of a building. , Set the button telephone device connected to the central line to the master with a DIP switch or the like that switches between the master mode and the slave mode, set the subsequent button telephone devices to the slave, and set the master and slave to
By connecting a relatively long distance with a signal line capable of high-speed serial transmission, the master and slave exchange serial data under the control of the master, and digitize the audio signal and put it on the serial data transmission line. , A small premises line control device characterized in that it is possible to expand and connect n station lines to a j-fold extension of i lines in a wide range of places such as different floors, different rooms or different buildings Extension method.